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Oops, thought there may be gotchas to that multi-arch python wrapper -
it wasn't quoting its arguments properly - here is now what I have as
/usr/bin/python :
$ cat python
#!/bin/bash
ME=0ドル
ME=${ME##*/}
VERSION=${ME#python}
VERSION=${VERSION:-2.7}
ARCH=`uname -m`
CMD=''
case $ARCH in
 i686)
 CMD="/usr/bin/32/${ME}"
 ;;
 *)
 CMD="/usr/bin/python${VERSION}.bin"
 ;;
esac
for((a=1;a<=$#;a++));do CMD="${CMD} '"$(eval 'echo -n "$'$a'"')"' ";done
eval "exec $CMD"
I had to move the /usr/bin/python${VERSION} executables to 
/usr/bin/python${VERSION}.bin , and replace them with copies
of this python script (which runs whichever version it is named by).
And I can do:
$ python -c 'import os
import sys
import commands
print commands.getstatus("ls -ld /.")
'
drwxr-xr-x. 25 root root 4096 Apr 20 15:28 /.
under both the native x86_64 and a 'setarch i686' environment with
the same results.